#include<iostream>

class Demo
{
public:
	Demo(int count) :_count(count)
	{
	}
	~Demo()
	{
	}

	void say(const std::string& mes)
	{
		fprintf(stderr, "%s\n", mes.c_str());
	}
private:
	int _count;
};

int main()
{
	Demo* d = NULL;
	d->say("hello world");
}